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AD5290YRMZ100-RL7 Arkusz danych(PDF) 10 Page - Analog Devices

Numer części AD5290YRMZ100-RL7
Szczegółowy opis  Compact 30V/짹15V 256-Position Digital Potentiometer
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Producent  AD [Analog Devices]
Strona internetowa  http://www.analog.com
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AD5290YRMZ100-RL7 Arkusz danych(HTML) 10 Page - Analog Devices

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Preliminary Technical Data
AD5290
Rev. Pr C | Page 10 of 11
VA/B/W. The relative order of powering VA, VB, VW, and the
digital inputs is not important as long as they are powered after
VDD and VSS with respect to GND.
LAYOUT AND POWER SUPPLY BYPASSING
It is a good practice to employ compact, minimum lead length
layout design. The leads to the inputs should be as direct as
possible with a minimum conductor length. Ground paths
should have low resistance and low inductance.
Similarly, it is also a good practice to bypass the power supplies
with quality capacitors for optimum stability. Supply leads to
the device should be bypassed with disc or chip ceramic
capacitors of 0.01 µF to 0.1 µF. Low ESR 1 µF to 10 µF tantalum
or electrolytic capacitors should also be applied at the supplies
to minimize any transient disturbance and low frequency ripple
(see Figure 4). Note that the digital ground should also be
joined remotely to the analog ground at one point to minimize
the ground bounce.
Figure 4. Power Supply Bypassing
DAISY CHAIN OPERATION
The serial data output pin (SDO) can be used to daisy chain
multiple devices for simultaneous operations, see Figure 12. The
SDO pin contains an open drain N-Ch FET and requires a pull-
up resistor. Users need to tie the SDO pin of one package to the
SDI pin of the next package. If many devices are daisy-chained,
users may need to increase the clock period to accommodate
the time delay introduced by the pull-up resistors and the
capacitive loading at the SDO-SDI interface, see Figure 12.
If two AD5290 are daisy chained, this requires total 16 bits of
data. The first 8 bits goes to U2 and the second 8 bits goes to
U1. The CS should be kept low until all 16 bits are clocked into
their respective serial registers. The CS is then pulled high to
complete the operation.
Figure 12. Daisy Chain Configuration
AD5290
SDI
SDO
CS
CL K
AD5290
SDI
SDO
CS
CL K
2.2K
Rp
VDD
U1
U2
S CLK
MO SI
S S
m
uC
AD5290


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